Couples who fight after having a baby are fighting usually due to the stress of taking care of a baby.
Babies and kids are wonderful and a joy to be around and I love my kids dearly but sometimes they stress me out so much that I have to send them off to Grandmas just to keep my sanity.
Sometimes it's also nice to go out to dinner without the kids and just have a quiet time with my husband but then when I get home I'm ready to see my kids again.
Having kids is not easy and it's expensive and stressful to take care of them and if you love your kids you'll worry about them a lot.
Sometimes my husband and I will fight about things when it comes to our kids because we are so stressed out and then later on we settle down about it.
That's at least the reason for us but other people may be fighting about their kids and babies for other reasons.